Interlock



A. R. FRIEGEL May 11, 1948.

INTERLOCK Filed Sept. 19, 1944 6 Sheets-Sheet 1 AMQW@ A TTD/@MEV May 1l, 1948. A. R. FRlEGEl. 2,441,315

l INTERLOCK YFiled sept. 19, 1944 e sheets-shew 2 I y INVENTORl Y* Lu u 67W MQW 'A TTOQNEY May 11, 1948. A. R; FRIEGEL 2,441,316

INTERLOCK 6 Sheets-Sheet 3 Filed sept. 19, 1944 ,WKQMW KWWL@ TTO/Q/VEY QU r-i if i d@ r;

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May 1l, 1948. A, R, FRlEGEL 2,441,316v

Filed Sept. 19, 1944 6 She SSSSSS et 4 15 l? 12413 ,Q @61,0 Q

A. R. FRIEGEL INTERLOCK May 11, 1948.

6 Sheets-Sheet 5 L() HIIYVENTOR. @v7/ fw 'BY Filed Sept. 19, 1944 May 11, 1948. A. R. FRIEGEL 2,441,316

INTERLOCK Filed Sept. 19, 1944 6 Sheets-Sheet 6 n 5/ H3 H38 A @l/z'i v C N I t 13 89 n; 95 I 9. l \\i .s 7%?! a @s g@ s 'N12 5 J T g2 mf X O Q. m' 88 8S 02:

ATTORNEY Patented May 11, 1948 INTERLOGK AugustgR. .Friegel,- NewfYork, N. Y.; Elsie M. Friegel,"v administratrix. of said August` R. Friegel, deceased, assignor to The Superior ApplianceA Company, .New York, N. Y; a copartne'rship Application September 19, 19,44; Serial No. 554,7554

aciaims..` (c1. :zoo-.50).V

This: invention; relateszfto aceviceto insure: thei correctsequential operation of;re1ated' mech:

anismsgcommonly called: a' key,u interlock;

A' principal. objectA off this; invention is., to prof vide; devices: offl the. character described: which` are;

sov constructedrand arrangedrthatl they are Auni,- versal, that: is; may be.. assembled, without; structural. alteration,.so:as to conform toany desired situation.

Other'4 objects andf advantages will be;l pointed out` as theV description progresses and the novelfeatures will be; particularly.U pointedi out. -in the lppendedlclaimsi In describing" the invention-, in detai1, reference will be had to the. accompanying drawingsand thev severaliviews thereon, inLwhichiA like characters of reference refer tolikei parts; through.- outthe several views and.; in: which:4

Fig. 1 is a longitudinal,vertica1,sectional viewv of a combination of'.` devices embodying` my invention; Fig. 2 is a topy plan'` view ofthe device as shown by Fig. 1;. Fig. 3.,isa horizontal,- sectional view of the. device asy shownk by Fig. 1 on the plane indicated by the linefI-IIf--III viewed in the direction of the arrows at; the ends of the line; Fig'. 4 is agvertical, sectional viewcf theV device as shown by Fig. l onathe plane` indi*- cated by the line IV--IV viewed in:y the direction of the arrows-atthe ends of the line; Fig.V 51s a vertical, sectional view of the device as shown by Fig, l on the plane indicatedibythe line V--V viewed in the directionv of the arrows at the ends of the line Fig.` 6 isa.- vie-wy similar to Fig-..4. but illustrates the removing of a pair` of joined barrels; Fig. '7 isy a horizontal, sectional view of the device as shown by Fig. 6 on the plane indicated by the line VII- VII viewed in the direction of the arrows at the ends of the.` line;y Fig. 8 isl a fragmentary, vertical, cross sectional view onthe same plane as that` of Fig. 1 but viewed from the other side; Fig. 9 -is a perspective view illustrating the joined lock barrels usedwith my invention; Fig. 10 is a view similar to'vflivg. 1 but illustrating a different combination of auxiliary device; Fig. 11 is a vertical, crossl sectional view of the device as shown by Fig. 10 onI the plane indicated by the line XI-XI viewedv in the direction of the arrows at the ends of the. line; Fig. 12 is a side elevational view withsorne` parts broken away to more clearly show the internal construction of a more simpley combination than that shown in Fig. 1; Fig. 13 is a side elevational view, with parts broken away to more clearly show the internal construction of another combination,` but different from that of Fig. 1;. 1i

' isf-a crosssectional-. viewsimllar to Fig. 6, but

sectioned inY greater detailto show` the operation o fz` aglrey;A Fig 1 5 is a-` cross sectional view` of the device as `shown by. Fig. 14V onltheiplane.` indicated byK thev line;A `viewed in the direction oi the-v arrows atthe endsoitheline; Fig. 16 is a view similar toyFig, 14 butfillustrating the operationaoffadifferent form oflkey;A Fig. 1'7 isa cross sectional Av-iew of; the devicev asv shown byv Fig. 16 on theV plane indicated.y by the line Xml-.XVII viewed inthe direction ofA thearrowsat the ends of;l the; line; Fig; 18; isl a perspective viewy oi? a detaching cylinder used with.l my invention; Fig. 19,v -is a1 fragmentarmcrcss sectionalview on the sameplane` as Fig. 3-. but illustrating the position by. the lineXXIj-XXL' viewed in the direction off the arrowsatthe; endsV ci the line.

In certain, situations;l it is important that one device be in4 a deiinite condition before` another device is accessible or manipulatable. For instance, it is often quitel important that an oil circuit breaker' be` opened before a main switch in the same electric power circuit is accessible or operable. To. provide7 for thisA want, devices, called, key -interlocks, have been devised. These key interlocks are devicesl whichv may, in general be described as devices associated with dependent devices, and; so combined; that it is necessary to. place a first device in a particular condition before it is. possible to withdraw a key usable to. gain access to a second device and when. access is. thusgained to the second device, the` key may not be obtained to operate the irst device until the` secondv device has been restored to a predetermined condition.

1-Ieretoiore,v keyinterlocks, and their associated auxiliar-ies such as electro-magnetic locks, circuit controller-s; eye receivers, timers and bolts have been constructed, largely as special devices suited, generally, for one situation only.

My invention is directedy tothe key-receiving structure and the associated auxiliaries, such as electromagnetic locks, circuit controller, eye receivers.. timers and bolts with the purpose to provide such devices in such form that they are adapted to be used singly or combined to-pro- Vide required interlocking for any situation.

in Eig. l,V I have illustrated a combination, made possible by my invention, ofy four devices .each of utility in some problem of mechanical interlocking and in some cases desirably associated together.

In Fig. 1, the principal device is the key receiver, designated, as a whole by K. An electromagnetic lock is designated L. A circuit controller is designated C. Each of these devices is a separate article of manufacture and K may be used alone or combined with one, any, or all of the others. To combine one, any, or all of the devices with K, it is merely necessary to provide assembly bolts as B, Fig. 3, of the proper length and to suitably adjust the length of throw bolts T B.

The key receiver K is formed as substantiallya rectangular prism provided with various through bores, cavities, and orifices. A main cavity is I, well shown in Fig. 4. In this cavity,

a cylindrical lock cylinder 2 is positioned. This lock cylinder has a ange 3 resting on the top face 4 of the body 5, regulating the penetration of the cylinder. The cylinder also has shallow grooves 6 and 1 well shown in Fig. 8, at substantially opposite diametral points into which may be protruded holding set screws 8 and 9 by which the cylinder may be maintained tightly in position and properly positioned rotatively as respects its longitudinal axis. Depending from the cylinder is a crank arm I0, supported and operated in a manner which Awill be hereinafter fully described, which bears the depending crank pin II, positioned to engage in a cross slot I2 in a throw bolt I3. The crank arm is pivoted eccentrically to the center of cylinder 2 so that when it is oscillated, by means to be hereinafter described, the bolt I3 is reciprocated longitudinally. At this point, it may be stated that the key I4 is the means by which the crank arm I0 is oscillated. When the key is in the position as shown by Fig. 1 the key may be withdrawn, but the throw bolts I3, I5 and I 6 will be in the position as shown by Fig. 1, that is, all to the extreme left as viewed in Fig. 1. In this position, throw bolt I6, prevents the removal of the eye piece I1. Eye piece I1 may be considered, as in usual practice, as is well understood by those skilled in the art, to be any device which must be movable when key I4 is removed from cylinder 2, that is, a device such as a main switch which has been closed and locked closed before key I4 may be removed to unlock an oil switch, in the same circuit, which has previously been opened, releasing key Id, and cannot again be closed without the use of key I4 and when closed prevents the removal of key I4 therefrom. Such general objects have heretofore been accomplished by the prior art and may be said to be indicated generally by the patent to Kirk No. 2,065,859, granted December 29, 1936.

Throw bolt I3, shown in end view in Fig. 4, lies in a through bore I8 in body 5. This bore intersects cavity I. The throw bolt I3 is preferably cylindrical and is formed at each end with means for connecting to throw bolts at each end thereof when K is used in combination with auxiliary, devices on each side thereof. If used without such auxiliary devices the ends of bolt I3 may be plain or as desired. Throw bolt I3 is also formed with a groove |23, into which protrudes a pin I24, thus preventing the bolt from turning.

At the left hand end of bolt I3 as viewed in Fig. 1, a cylindrical tongue of reduced diameter I9 is formed. This tongue protrudes into a cylindrical cavity in the end of throw bolt I5. This cavity 20 and tongue I5; are made a rather loose t so that problems of accurate alignment will not arise. Through bores, 2I and 22, at a right angle to one another, are formed through the end of bolt I5 and also tongue I9 and through one of these bores a pin 23 is passed securing I3 to I5. If it were advisable or necessary to rotate bolt I5 on its axis through ninety degrees then the bore 2l in I5 would be used toy receive pin 23. This construction provides freedom from excessive care in securing alignment of the throw bolts and also allows the variousthrow bolts and the auxiliaries to which they appertain to be rotated relatively through an angle of ninety degrees or multiples thereof.

As it is frequently necessary or desirable to control the throw of bolt I3 and so bolts I5 and I6 from a remote point in accordance with the conditions at a remote point, I provide bolt I5 with means for locking it electro-magnetically. This means, preferably, includes a notch 24 formed in bolt I5 and a locking plunger 25 adapted to rest in the notch. Just so long as the locking plunger is in the notch, the bolt may not be moved by manipulating key I4. Under the proper condition the coil 26 is energized in a usual or ordinary manner by applying a difference of potential to wires 21 and 28, whereupon, lock plunger 25, formed of magnetic material, is drawn upwardly out of notch 25 and thereafter throw bolt I5 may be moved longitudinally. In short, the operation of bolts I3 and I5 and so key I4 is controlled or governed electro-magnetically, in this case by the closing of a circuit, thus raising plunger 25 against gravity and the action of a spring, as 23, if desired.

Electro-magnetic lock L includes a base 30 formed with through bores, as v3l and 32, well shown in Fig. 3, through which the combining bolts B may pass to bind the electro-magnetic lock to the body 5 of the key receiver K.

In the combination shown, an eye receiver E is attached to the left hand end of lock L, as shown in Fig.'1. The eye receiver is substantially a rectangular prism 33 formed with side flanges 34 and 35, well shown in Fig. 2. Through bores 33 and 31 extend through the anges for the reception of the binding bolts B. The body is also formed with a cavity 38 simulating a bore for the reception of a throw and locking bolt I6. This bolt |15 is positioned to pass through the eye piece I1, attached to any suitable or desired body, which is provided with through bores 39 and 4l! for the purpose of receiving bolt I6. When the locking bolt I6 is in the position as shown in Fig. 1 the eye piece I1 cannot be withdrawn from the eye piece receiver.

The locking bolt I6 may be attached to throw bolt or electro-magnetic bolt I5 by a connection identical with that between I3 and I5, but it ls preferred to modify it by entering the full diameter of cylindrical bolt I6 into the cavity in I5.

Body 33 of the eye piece receiver is formed with two slots 4| and 42 to separately receive the tongues 43 and 44 of the eye piece. In each o! these slots there is a plunger or tumbler, as 45 and 46, spring pressed by springs as 41 and 48. These plungers 45 and 46 are cylindrical but their diameter is slightly greater than the width of the slots 4I and 42 so that when bolt I6 is withdrawn and eye piece I1 is removed, the plungers extend so that their lower ends are on a line with the bottom of the cavity 38, small grooves, as 49, 5U, 5I and 52 being formed in the body so that they may so function. They may be inserted and removed by removing blind screws 63 and B4,v which also serve as abutments for springs 41 and 4l.

It will be observed that locking bolt i6 is reduced on its outer end to about one-haii of `its diameter leaving a flatv face B5. This is part oi the construction to prevent unauthorized and unwarranted operation of Ythe device. It eye piece |1 isy removed after boltV I6, is withdrawn, then plungers and 46 descend to cover cavity 36 to prevent entrance of bolt I6, and boit I6 may be returned to the position as shown in Fig. 1 only after eye piece I1 has first been returned forcing back plungers 45 and 46. somebody might attempt to evade the proper operations of the device andv insert an instmment or tool in slot 42 forcing plunger 46 inwardly. Then bolti6 could be moved to the left even if eye piece II' were not in place. But bolt I6 would be stopped by plunger 45. If this were then forced back by some instrument, it would no longer prevent the complete throwing of bolt; I6, but by forming a flat and a resulting stop shoulder 56 on the bolt, thev plunger 46 would abut theshoulder 56 and preventrcomplete throw of the bolt. To successfully evade the proper functioning of the device a special tool or tools would have to be provided which would hold both plungers back at the same time and also allow a throw of the bolt. In order to successfully evade proper functioning it would probably be necessary to construct a device simulating the eye piece I'I, but then when the bolt is completely thrown, the device would be locked in place and would give evidence that the proper functioning of the devicev had been evaded. In order to further prevent maliciously inclined persons from improper operation of the device, end walls |25 and |26 have been supplied. These cover and protect plungers 45 and 46.

Eye receiver E may be combined as shown in Fig. 1 or it may be rotated 180 about the bolt I6 from the position shown, so that it serves for an eye piece to be locked'approaching either from the top or the bottom as viewed in Fig, 1.

As is well known, it is desirable, at times, to make or break an electrical circuit by. the operation of the key receiver. For this purpose, I have devised a circuit controller C which may be used alone or in combination. with the other auxiliaries to cooperate with the key receiver.

The circuit controller Cis in the general form of a rectangular hollow box formed by walls, of which one, the top 51 is, preferably, easily removable being attached by screws58, 59, 60 and 6|. It is attached to key receiverl K by bolts B as best shown in Fig. 3. The box contains electrical contacts asA needed. I have shown two pairs of stationary contacts 62, 63. 64 andv 65, each properly mounted and insulated. I have also shown a movable circuit controlling bar 66, which may support neededA cross connection. bars as 61. The wire outlet is shown at 68 and two wires at 68. and 1li'. One wire is connected to post 1| and the other to post 12', thus utilizing. sta.- tionary contacts 62 and 63. The movable circuit controlling bar 66 is connected to throw bolt I3 by a connection identical with the connection between I3 and l5, sothat when throw bolt` I3 is oscillated, bar 66 is oscillated, and connection between 62 and 63' is made and broken. The circuit thereby controlled may be used in any of the well known ways.

As the whole combination may, at times, be exposed to the weather, I have provided a storm cover. 13, hinged at 'I4 and spring pressed to However,

closed position-hy spring 15. The cover. when closed.. ls slightly `spaced from a water bai'e 16 which prevents water from entering the space in which the` top of the cylinder 2 is positioned and in which the key slot is situated.

In Fig. 10, I have shown a combination of the key receiver K, the circuit controller C, the electro-magnetic lock L and a timer T.

The timer T is substantially a rectangular prismV formed with a through bore 1'I. although kclosed at the top by a cover |22, a through bore 18, at a right angle thereto. The bore 'Il receives the locking bolt 80. This locking bolt is connected to throw bolt I5 inthe same manner that I5 is conected to I3. The bolt 80 is cylindrical in form but is formed with a cut away disc receiving portion 8|. The disc 82 which cooperates with cut away portion 8| is mounted to oscillate. When the bolt is in the position as shown in Fig. 10, a flattened portion on the disc rests upon the top of bolt 8i! preventing oscillation thereof, but when the bolt is thrown to the right as viewed in Fig. 10, then the cut away portion 0| comes under the disc 82 and itfmay be oscillated so that it rests in the cut away portion 6|, thus restraining av return of bolt 80 to the' position as shown `in Fig. 10.

In order to provide for the oscillation of disc 82., it is mounted on a 'disc shaft '63', which in turn is mounted in bearing cavity 19.A The disc is held in'position on shaft 83 by set vscrew 64.

Shaft 83 extends outwardly of the body at the timer and has a crank arm 85 mounted thereon. A suitable or `desired mechanism, as is well understood, may be connected .to the free end of crank 85, as by a link 86. The mechanism so connected by linkv 86 willbe .locked from movement when bolt 80' is in the position as shown in Fig. 10 and bolt' 86 will be locked against return movement .after disc 82 has been turned into cut away portion 8|. That is, a device connectedl to crank arm 85 must be in a certain definite position so that 82 will be in a certain definite position in order, in one case forf to be moved and in the other case for 85V to be moved. This device connected to crank arm 85 may well include an elapsed time element and so the whole device is called a timer.

The key receiver K is thefundamental controlling device and this operatesl by insertion of key I4. When key I4 is cscillated, crank arm III is oscillated and so crank pin tI. In order to prevent the crankr pin from being oscillated too much, a. crank pin stop 81l is provided, see Figs. 19, 20 and 21. This, in the preferred form, is in. the form ofxa cylindrical pin positioned in a bore 88 of key receiver. body 5. The outer end of the pin is threaded and two nuts placed thereon which by adjustment will determine the extent to which pin 81 will extend into cavity I.. The bore t6 is enlarged at 89" to provide a shoulder for one of the: nuts to bear against. The enlarged bore 89 is closed by the blind screw 96. As at times, the device is changed from what may be called right .hand oscillation'as described. to left hand oscillation, a bore is? formed in the opposite side of the body for the reception of 7 dered disc 96 extend two shouldered pins 98 and 99 whichare headed or riveted below crank arm vI and extend upwardly into a cavity |00 of cylinder 2. These pins are the direct means for oscillating crank I0. The two pins 98 and 99 extend into the body of an unlocking cylinder IDI, as shown in Figs. 6 and 15. This unlocking cylinder yI0I is formed with a. key slot I02. When the proper key is inserted in the slot, the tumblers |03 to |08 inclusive, as shown in Fig. 14, are ad- J'usted so that their ends aline with line |09, sothat by turning key I4, unlocking cylinder IOI may be oscillated and so crank arm I0 oscillated and the throw bolts, as I3, operated. When the cylinder I 0I has been oscillated, the lineup of the tumblers, as shown in Fig. 15, is changed, that is,'the key I4 cannot then be removed because it is held by the tumblers, as |03, because the tumblers cannot then move back into cavities, as I Ill.

Locking cylinder I0| is positioned within detaching cylinder III 4and this cylinder is positioned in a barrel I I2 permanently joined to tuinbler and spring barrel II3. Both barrels II2 and II3 t'snugly within a like shaped cavity |00 of cylinder v2, except that the lower portion of the cavity has the portions underlying I I4 and II5 cut away thus making the portions provide a shoulder on each side within the cavity, as shown in Fig. 7 at II6 and II1. Shoulder II'I is provided to engage with the end of segment II8 forming part of barrel I I I.

In order to place the connected barrels I I2 and I I3 into cavity |00 of cylinder 2, a removing and replacing key I I9 is placed in the key slot |02. This key lines up the tumblers I 03 to I 08 inclusive as shown in Fig. 16 so that a parting may be made :along the line I20 as shown in Fig. 16. Due to this, detaching cylinder III may be oscillated, bringing segment IIB into position by oscillation in the direction of arrows I2I so that it does not protrude beyond the contour of barrels H2 and II3. Under such conditions, the barrels may be inserted downwardly into cavity I 00 of cylinder 2 and when flange 3 seats, the Vkey I I9 upon being turned back will again cause segment II8 to protrude and catch under shoulder I'I. To remove the barrels the saine sequence of operations are gone through in reverse order. The appearance of the removed barrels is best shown in Fig. 9.

From the above description it will be understood that a key operated device is provided which may be operated to throw a bolt with one particular formed key, and may be inserted or removed from a containing cavity with another and that when in the cavity it is held therein by means which prevents its removal except by a proper key.

From the above given description it will be seen that I have provided a key interlock which includes a key receiver including an operating crank pin which may be operated as a right hand device or as `a left hand device, and have provided al stop to linut the motion thereof which may be positioned to limit the motion of either a. right hand moving crank pin or a left hand moving crank pin.

It is further evident that the cylindrical lock per se of my key receiver may be arranged in such a way that the tumblers Will be of such length and so disposed that they will cooperate with la key of indefinite edge contour. It is also evident that I can arrange the tumblers so that one form of key will operate the crank pin and another form of key will be usable to withdraw the joined barrels from the cavity of the cylinder in which they are positioned and that I may place in that cavity any similar joined barrels with any particular tumbler combination that I see fit, or, if desired, I may withdraw the containing cylinder entirely and substitute a new containing cylinder with the desired joined barrels and tumblers therein.

From the above description it is further seen that with the key receiver I may combine a circuit controller alone or an electro-magnetic lock alone, or an eye receiver alone or any combination of such auxiliary devices with the key receiver, or the key receiver may be used alone to throw a bolt into an eye.

It is also seen that the combinations may be made by placing the circuit controller on the right hand side of the key receiver or on the left hand side of the key receiver and that the electro-magnetic lock and likewise the eye receiver may be placed either to the right or to the left of the key receiver. The timer may also be used with the key receiver alone or in conjunction with the electro-magnetic lock or in conjunction with the electro-magnetic lock and the circuit controller and if necessary the eye receiver may be positioned by the side of the timer.

In short, a key receiver and a number of auxiliary devices have been devised which are so usable and so combinable that by the proper combination thereof any condition generally made with any key-locking may be successfully solved by the use of devices which are standard and which do not have to be especially made for the particular conditions.

Although I have particularly described one particular physical embodiment of my invention and modifications thereof, nevertheless, I desire to have it understood that the form selected is merely illustrative and does not exhaust the possible physical embodiments of the idea of means underlying my invention.

What I claim as new and desire to secure by Letters Patent is:

1. In a key interlock, in combination: a key receiver formed with through bores for the reception of binding bolts; an electro-magnetic lock formed with through bores for the reception of binding bolts; an eye receiver formed with through bores for the reception of binding bolts; a current controller formed with cavities for the reception of the ends of binding bolts; binding bolts in the bores with their ends in the cavities whereby the key receiver, the electromagnetic lock, the eye receiver and the circuit controller may be combined in line; means included in the key receiver for receiving a key; throw bolts included in the key receiver, the electro-magnetic lock and the eye receiver and a circuit controlling bar in the circuit controller all connected; means controlled by the electromagnetic lock for preventing and allowing reciprocation of the throw bolts; means operated by the key adapted to reciprocate the throw bolts whereby an eye in the eye receiver may be locked or unlocked.

2. In a key interlock, in combination: a key receiver, an electro-magnetic lock, an eye receiver, and a circuit controller formed with abuttable surfaces and through bores for the reception of clamping bolts whereby the key receiver may be combined with one, any, or all of the other devices.

3; In a key interlock, in combination: a key 9 receiver, and an electro-magnetic lock formed with similar abuttable surfaces on each side with through bores whereby they may be bound together with binding bolts and the electro-magnetic lock may be positioned abutting one surface or the opposite surface of the key receiver and binding bolts binding thereceiver and lock together.

4. In a key interlock, in combination: a key receiver formed with through bores and opposite identical surfaces whereby auxiliary devices may be bound thereto to abut either of the identical surfaces and bolts in the through bores for binding the key receiver and the auxiliaries.

5. In a key interlock, in combination: a key receiver including a throw bolt; auxiliaries attached to each side of the key receiver and including throw bolts having their ends adjacent and means for connecting the throw bolts allowing misalignment thereof.

6. In a key interlock, in combination: a key receiver including a throw bolt; auxiliaries attached to each side of the key receiver and including throw bolts having their ends adjacent, the several throw bolts being formed at their adjacent ends one `with a tongue and the connecting bolt with a cavity loosely receiving the tongue and a. pin passing transversely through both adjacent ends.

7. In a key interlock, in combination: a key receiver including a throw bolt; auxiliaries attached to each side of the key receiver and including throw bolts having their ends adjacent, the several throw bolts being formed at their adjacent ends one with a tongue and the connecting bolt with a cavity loosely receiving the tongue and two through orifices in each tongue and cavity end and at a right angle one to the other whereby the bolts may be connected in two positions each relatively rotated 90 from the other; and a pin passing through the orifices of tongue and cavity and securing the adjacent ends together.

8. In a key interlock, in combination: a key receiver including a throw bolt and means to reciprocate the throw bolt; a timer including a throw bolt connected to the throw bolt of the key receiver, said timer also including a shaft at a right angle to the throw bolt mounted ior oscillation; a disk on the shaft formed with a attened portion adapted to rest on the throw bolt of the timer, said throw bolt of the timer formed with a cut away portion forming a shoulder whereby when the bolt is in one position the disk lcannot be oscillated by the shaft and when the bolt is in another position the disc may be oscillated into the cut away portion thereby preventing movement of the timer throw bolt and the key receiver throw bolt and a crank arm connected to the shaft :controlled as to possibility of movement by the throw bolt of the ti-mer, said key receiver formed with opposite surfaces and through bores and the timer formed with through bores whereby the timer may be assembled with the key receiver on either side thereof and bolts for binding the key receiver and timer together.

9. In a key interlock, in combination: a key receiver including a throw bolt and means reciprocating the throw bolt, said key receiver formed with through bores and opposite faces; an eye receiver adapted to abut either of the opposite `faces of the key receiver and be bound thereto; bolts for binding the eye receiver to the key receiver; a throw bolt in the eye receiver connected to the throw bolt of the key receiver and means including the form given to the eye receiver throw bolt to prevent the entrance of the eye receiver throw bolt into the eye receiver unless there is a proper eye piece resting in the eye receiver.

AUGUST R.. FRIEGEL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name- Date 1,561,771 Best Nov. 17, 1925 1,564,463 Best Dec. 8, 1925 1,656,854 Best Jan. 17, 1928 2,108,634 Wilms Feb. 15, 1938 2,166,061 Kirk Jan. 11, 1939 

